Fix deprecations

1. `logger.warn()` -> `logger.warning()`
2. Don't use `is not` with a literal

tc_aws/aws/storage.py

@@ -110,7 +110,7 @@ def _normalize_path(self, path):
         path_segments = [path]
 
         root_path = self._get_config('ROOT_PATH')
-        if root_path and root_path is not '':
+        if root_path and root_path != '':
             path_segments.insert(0, root_path)
 
         if self.is_auto_webp:

tc_aws/loaders/s3_loader.py

@@ -115,7 +115,7 @@ def _get_key(path, context):
     :rtype: string
     """
     root_path = context.config.get('TC_AWS_LOADER_ROOT_PATH')
-    return '/'.join([root_path, path]) if root_path is not '' else path
+    return '/'.join([root_path, path]) if root_path != '' else path
 
 
 def _validate_bucket(context, bucket):

tc_aws/storages/s3_storage.py

@@ -106,7 +106,7 @@ async def get_crypto(self, path):
         try:
             file_key = await self.storage.get(crypto_path)
         except ClientError as err:
-            logger.warn("[STORAGE] s3 key not found at %s" % crypto_path)
+            logger.warning("[STORAGE] s3 key not found at %s" % crypto_path)
             return None
 
         async with file_key['Body'] as stream:
@@ -161,4 +161,3 @@ async def remove(self, path):
         :param string path: Path to delete
         """
         return await self.storage.delete(self._normalize_path(path))
-